Joachim's Ko-Semeai - Putting the Cart
Before the Horse (2013 - 2015)
9b - White Kills Black's Group in the Lower Left
( 988) (Referenced by 95) We inserted White's gote-sente-combination of , , , in the hanezeki, which leaves Black behind in a grave dilemma. is a suicidal ko-threat, so it is not available now. , and , are no valid ko-threats, because White's centre group has five liberties left. Black's ko-threats , and , in the nakade are compensated for by White's ko-threats , and , in the top left corner. This implies that Black cannot have occupied a shared liberty, at , but must have captured on the upper edge, instead. Another option would be that White did not capture the ko, but occupied a liberty, instead. |
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We consider Black's option first. captured the ko on the upper edge. White's group has six liberties (w, 4 * c, m, Black's group has eight liberties (3 * b, 4 * c, k), so we are a bit early here. |
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///: We consider White's options now. Even if White waits a bit too long before capturing the ko for the first time, Black will not be able to win. occupied a liberty of Black's group, and did not capture . |
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///: Please note that inserting the exchange of , earlier would not have helped Black's group to escape its fate. |
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///: White has the points to available for her four moves in a row, also killing Black's large -group on the left side. |
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